GB753030A - Improvements in sound television receivers - Google Patents
Improvements in sound television receiversInfo
- Publication number
- GB753030A GB753030A GB5321/54A GB532154A GB753030A GB 753030 A GB753030 A GB 753030A GB 5321/54 A GB5321/54 A GB 5321/54A GB 532154 A GB532154 A GB 532154A GB 753030 A GB753030 A GB 753030A
- Authority
- GB
- United Kingdom
- Prior art keywords
- carrier
- circuit
- detector
- frequency
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
- H04N5/60—Receiver circuitry for the reception of television signals according to analogue transmission standards for the sound signals
- H04N5/62—Intercarrier circuits, i.e. heterodyning sound and vision carriers
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Television Receiver Circuits (AREA)
Abstract
753,030. Multiplex radio signalling; automatic gain control. GENERAL ELECTRIC CO. Feb. 23, 1954 [Feb. 24, 1953], No. 5321/54. Class 40 (5). In an intercarrier sound/vision radio receiver, the audio carrier energy reaching the second detector from a wide-band audio and video carrier amplifier is varied according to the amplitude of the beat frequency output of the detector, by controlling means for absorbing such energy from the amplifier. In the embodiment described the R.F. and frequencychanger stage 4 and the I.F. stages 6, 10, 8 feed the second detector 12, which provides the video signal for the picture tube 16 and feeds the sync. separator 18 controlling the scanning circuits 20, 22. The second detector output is also connected to the circuit 32, 34 which is series resonant to the inter-carrier beat frequency 4.5 M/cs. A tapping on inductance 34 is connected through capacitance 78 to a pentode limiter 72, the output of which provides the audio signal in discriminator 40 to energize the reproducer 44. The output of the I.F. stage 10 is developed across a circuit 48, 50, tuned to the audio carrier frequency, some of the energy in which is absorbed by a circuit 52, 54 magnetically coupled thereto and similarly tuned. In order to vary the amount of energy absorbed by circuit 52, 54, the capacitance 54 is shunted by a series circuit comprising capacitances 60, 62 and a diode 58, the junction of 60, 62 being earthed. The diode is normally biased to cut-off by a fixed positive voltage from potential divider 64, 66 applied to its cathode. Application of a variable positive voltage to its anode, over lead 70, renders it conducting to a variable degree. This control voltage is derived from the cathode resistance 79 of the limiter 72, the current through which varies with the amplitude of the beat-frequency applied to the grid, as the timeconstant of capacitance 78 and grid resistance 80 is such that the valve acts as a grid-cathode limiter. The changes in beat-frequency amplitude are made a function of the sound carrier alone by known gain control circuits applied to the video carrier.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US338195A US2880269A (en) | 1953-02-24 | 1953-02-24 | Controllable trap circuit for intercarrier sound television receiver |
Publications (1)
Publication Number | Publication Date |
---|---|
GB753030A true GB753030A (en) | 1956-07-18 |
Family
ID=23323809
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB5321/54A Expired GB753030A (en) | 1953-02-24 | 1954-02-23 | Improvements in sound television receivers |
Country Status (4)
Country | Link |
---|---|
US (1) | US2880269A (en) |
BE (1) | BE526740A (en) |
FR (1) | FR1095988A (en) |
GB (1) | GB753030A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1212988B (en) * | 1959-03-11 | 1966-03-24 | Loewe Opta Ag | Multi-standard television receiver for the optional reception of programs with amplitude-modulated or frequency-modulated accompanying audio signals |
DE1268189B (en) * | 1959-12-02 | 1968-05-16 | Philips Patentverwaltung | TV receiver with automatic change of the transmission curve |
DE3040251A1 (en) * | 1979-10-26 | 1981-05-07 | RCA Corp., 10020 New York, N.Y. | SIGNAL DISCONNECT |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2901535A (en) * | 1954-11-08 | 1959-08-25 | Rca Corp | Frequency selective signal attenuating circuit |
US3911366A (en) * | 1958-11-13 | 1975-10-07 | Elie J Baghdady | Receiver interference suppression techniques and apparatus |
US3025343A (en) * | 1958-12-24 | 1962-03-13 | Philco Corp | Television receiver employing if amplifier with variable response characteristic |
NL6817659A (en) * | 1968-12-10 | 1970-06-12 | ||
NL6905094A (en) * | 1969-04-01 | 1970-10-05 | ||
NL7012829A (en) * | 1970-08-29 | 1972-03-02 | ||
US4081839A (en) * | 1976-10-18 | 1978-03-28 | Blonder-Tongue Laboratories, Inc. | Aural-visual ratio control apparatus |
US4633316A (en) * | 1984-11-14 | 1986-12-30 | Zenith Electronics Corporation | Stable low cost 4.5 MHz remodulator |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2632047A (en) * | 1948-06-11 | 1953-03-17 | Motorola Inc | Television gain control system |
-
0
- BE BE526740D patent/BE526740A/xx unknown
-
1953
- 1953-02-24 US US338195A patent/US2880269A/en not_active Expired - Lifetime
-
1954
- 1954-02-23 GB GB5321/54A patent/GB753030A/en not_active Expired
- 1954-02-23 FR FR1095988D patent/FR1095988A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1212988B (en) * | 1959-03-11 | 1966-03-24 | Loewe Opta Ag | Multi-standard television receiver for the optional reception of programs with amplitude-modulated or frequency-modulated accompanying audio signals |
DE1268189B (en) * | 1959-12-02 | 1968-05-16 | Philips Patentverwaltung | TV receiver with automatic change of the transmission curve |
DE3040251A1 (en) * | 1979-10-26 | 1981-05-07 | RCA Corp., 10020 New York, N.Y. | SIGNAL DISCONNECT |
Also Published As
Publication number | Publication date |
---|---|
BE526740A (en) | |
FR1095988A (en) | 1955-06-08 |
US2880269A (en) | 1959-03-31 |
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